mirror of https://github.com/OpenIPC/firmware.git
50 lines
1.3 KiB
Diff
50 lines
1.3 KiB
Diff
diff -drupN a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
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--- a/drivers/md/dm-ioctl.c 2018-08-06 17:23:04.000000000 +0300
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+++ b/drivers/md/dm-ioctl.c 2022-06-12 05:28:14.000000000 +0300
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@@ -1927,6 +1927,45 @@ void dm_interface_exit(void)
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dm_hash_exit();
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}
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+
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+/**
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+ * dm_ioctl_export - Permanently export a mapped device via the ioctl interface
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+ * @md: Pointer to mapped_device
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+ * @name: Buffer (size DM_NAME_LEN) for name
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+ * @uuid: Buffer (size DM_UUID_LEN) for uuid or NULL if not desired
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+ */
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+int dm_ioctl_export(struct mapped_device *md, const char *name,
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+ const char *uuid)
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+{
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+ int r = 0;
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+ struct hash_cell *hc;
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+
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+ if (!md) {
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+ r = -ENXIO;
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+ goto out;
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+ }
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+
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+ /* The name and uuid can only be set once. */
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+ mutex_lock(&dm_hash_cells_mutex);
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+ hc = dm_get_mdptr(md);
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+ mutex_unlock(&dm_hash_cells_mutex);
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+ if (hc) {
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+ DMERR("%s: already exported", dm_device_name(md));
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+ r = -ENXIO;
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+ goto out;
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+ }
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+
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+ r = dm_hash_insert(name, uuid, md);
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+ if (r) {
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+ DMERR("%s: could not bind to '%s'", dm_device_name(md), name);
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+ goto out;
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+ }
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+
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+ /* Let udev know we've changed. */
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+ dm_kobject_uevent(md, KOBJ_CHANGE, dm_get_event_nr(md));
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+out:
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+ return r;
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+}
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/**
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* dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers
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* @md: Pointer to mapped_device
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